Nate Berkus in the dining room of his Manhattan duplex, in front of a custom-designed bookcase by Carlos Huber.

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Before

The family room.

Photo: Sony Pictures Television/Julie Holder

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After

The brick-walled family room had been coated floor to ceiling in white paint. In addition to installing white-oak herringbone parquet, the designer brought depth to the area with 19th-century French iron shelving units from Pavilion Antiques and a 1950s French desk accented by vintage brass faux-bamboo chairs; a Sony television is mounted above the fireplace. On the cocktail table is a Berkus chain-link sculpture for Target; the Madeline Weinrib rug is from ABC Carpet & Home, and the wall paint is Farrow & Ball’s Wimborne White.

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In the family room, a large photograph by Oswaldo Ruiz overlooks a vintage Milo Baughman chair, at left, and a pair of Paul McCobb stools; saguaro-cactus skeletons stand in the corner.

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A stainless-steel wall sculpture by Octavio Abúndez dominates one end of the living room; the bird painting is by Michael Hainey, and the Gilbert Poillerat chairs are clad in a Clarence House linen stripe.

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Before

The living room.

Photo: Sony Pictures Television/Julie Holder

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After

Metal-and-glass doors and a 19th-century mantel enhance the living room; the custom-made chairs are covered in a Great Plains linen by Holly Hunt, and the handwoven side table is from Mexico.

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A Fernando Bengoechea handwoven photo work hangs behind a Tony Duquette starburst sculpture; the dining table is set with hand-painted Mexican plates and surrounded by 1950s Jansen chairs.

Before

After

Berkus masked the awkward placement of two small, low windows with high-set blinds framed by long curtains; the airplane photograph is by Jeffrey Milstein from Tomas Maier.

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A handwoven photo work by Bengoechea is displayed above a marble mantel from Architectural Antiques; the bookcase is ’50s French, and the Lucite chair dates from the ’70s.

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A circa-1970 Gabriella Crespi desk sits at the foot of Berkus’s bed; the quilted coverlet, bed linens, and headboard—the latter upholstered in a Clarence House cotton velvet—are all Berkus designs for HSN, and the leather screen was custom made.

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The dressing room features a custom-made tufted ottoman, covered in a Clarence House velvet, and carpeting by Stark.

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In the master bath, fixtures from Circa Lighting crown bespoke brass mirrors from Robert Massello Antiques.

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Before

A guest room.

Photo: Sony Pictures Television/Julie Holder

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After

Replacing a glass-block wall with a glazed panel opened up a skylit guest room, where an antique French daybed from Pavilion Antiques now stands alongside a 1950s French table; the white-lacquer tortoise shell above the mantel is a Berkus design for Target, and the throw in the foreground is by Hermès.

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Before

The powder room.

Photo: Sony Pictures Television/Julie Holder

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After

A Piero Fornasetti wallpaper by Cole & Son lines the powder room; the custom-made rope mirror is by Nate Berkus Inc., the sconces are from Circa Lighting, and the sink fittings are by Waterworks.